text: /* crypto/cms/cms_ess.c */
  /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   * project.
   */
  /* ====================================================================
   * Copyright (c) 2008 The OpenSSL Project.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer. 
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. All advertising materials mentioning features or use of this
   *    software must display the following acknowledgment:
   *    "This product includes software developed by the OpenSSL Project
   *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
   *
   * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
   *    endorse or promote products derived from this software without
   *    prior written permission. For written permission, please contact
   *    licensing@OpenSSL.org.
   *
   * 5. Products derived from this software may not be called "OpenSSL"
   *    nor may "OpenSSL" appear in their names without prior written
   *    permission of the OpenSSL Project.
   *
   * 6. Redistributions of any form whatsoever must retain the following
   *    acknowledgment:
   *    "This product includes software developed by the OpenSSL Project
   *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
   *
   * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
   * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
   * OF THE POSSIBILITY OF SUCH DAMAGE.
   * ====================================================================
   */
  
  #include "cryptlib.h"
  #include <openssl/asn1t.h>
  #include <openssl/pem.h>
  #include <openssl/rand.h>
  #include <openssl/x509v3.h>
  #include <openssl/err.h>
  #include <openssl/cms.h>
  #include "cms_lcl.h"
  
  DECLARE_ASN1_ITEM(CMS_ReceiptRequest)
  DECLARE_ASN1_ITEM(CMS_Receipt)
  
  IMPLEMENT_ASN1_FUNCTIONS(CMS_ReceiptRequest)
  
  /* ESS services: for now just Signed Receipt related */
  
  int CMS_get1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest **prr)
  	{
  	ASN1_STRING *str;
  	CMS_ReceiptRequest *rr = NULL;
  	if (prr)
  		*prr = NULL;
  	str = CMS_signed_get0_data_by_OBJ(si,
  				OBJ_nid2obj(NID_id_smime_aa_receiptRequest),
  					-3, V_ASN1_SEQUENCE);
  	if (!str)
  		return 0;
  
  	rr = ASN1_item_unpack(str, ASN1_ITEM_rptr(CMS_ReceiptRequest));
  	if (!rr)
  		return -1;
  	if (prr)
  		*prr = rr;
  	else
  		CMS_ReceiptRequest_free(rr);
  	return 1;
  	}
  
  CMS_ReceiptRequest *CMS_ReceiptRequest_create0(unsigned char *id, int idlen,
  				int allorfirst,
  				STACK_OF(GENERAL_NAMES) *receiptList,
  				STACK_OF(GENERAL_NAMES) *receiptsTo)
  	{
  	CMS_ReceiptRequest *rr = NULL;
  
  	rr = CMS_ReceiptRequest_new();
  	if (!rr)
  		goto merr;
  	if (id)
  		ASN1_STRING_set0(rr->signedContentIdentifier, id, idlen);
  	else
  		{
  		if (!ASN1_STRING_set(rr->signedContentIdentifier, NULL, 32))
  			goto merr;
  		if (RAND_pseudo_bytes(rr->signedContentIdentifier->data, 32) 
  					<= 0)
  			goto err;
  		}
  
  	sk_GENERAL_NAMES_pop_free(rr->receiptsTo, GENERAL_NAMES_free);
  	rr->receiptsTo = receiptsTo;
  
  	if (receiptList)
  		{
  		rr->receiptsFrom->type = 1;
  		rr->receiptsFrom->d.receiptList = receiptList;
  		}
  	else
  		{
  		rr->receiptsFrom->type = 0;
  		rr->receiptsFrom->d.allOrFirstTier = allorfirst;
  		}
  
  	return rr;
  
  	merr:
  	CMSerr(CMS_F_CMS_RECEIPTREQUEST_CREATE0, ERR_R_MALLOC_FAILURE);
  
  	err:
  	if (rr)
  		CMS_ReceiptRequest_free(rr);
  
  	return NULL;
  	
  	}
  
  int CMS_add1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest *rr)
  	{
  	unsigned char *rrder = NULL;
  	int rrderlen, r = 0;
  
  	rrderlen = i2d_CMS_ReceiptRequest(rr, &rrder);
  	if (rrderlen < 0)
  		goto merr;
  
  	if (!CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_receiptRequest,
  					V_ASN1_SEQUENCE, rrder, rrderlen))
  		goto merr;
  
  	r = 1;
  
  	merr:
  	if (!r)
  		CMSerr(CMS_F_CMS_ADD1_RECEIPTREQUEST, ERR_R_MALLOC_FAILURE);
  
  	if (rrder)
  		OPENSSL_free(rrder);
  
  	return r;
  	
  	}
  
  void CMS_ReceiptRequest_get0_values(CMS_ReceiptRequest *rr,
  					ASN1_STRING **pcid,
  					int *pallorfirst,
  					STACK_OF(GENERAL_NAMES) **plist,
  					STACK_OF(GENERAL_NAMES) **prto)
  	{
  	if (pcid)
  		*pcid = rr->signedContentIdentifier;
  	if (rr->receiptsFrom->type == 0)
  		{
  		if (pallorfirst)
  			*pallorfirst = (int)rr->receiptsFrom->d.allOrFirstTier;
  		if (plist)
  			*plist = NULL;
  		}
  	else
  		{
  		if (pallorfirst)
  			*pallorfirst = -1;
  		if (plist)
  			*plist = rr->receiptsFrom->d.receiptList;
  		}
  	if (prto)
  		*prto = rr->receiptsTo;
  	}
  
  /* Digest a SignerInfo structure for msgSigDigest attribute processing */
  
  static int cms_msgSigDigest(CMS_SignerInfo *si,
  				unsigned char *dig, unsigned int *diglen)
  	{
  	const EVP_MD *md;
  	md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
  	if (md == NULL)
  		return 0;
  	if (!ASN1_item_digest(ASN1_ITEM_rptr(CMS_Attributes_Verify), md,
  						si->signedAttrs, dig, diglen))
  		return 0;
  	return 1;
  	}
  
  /* Add a msgSigDigest attribute to a SignerInfo */
  
  int cms_msgSigDigest_add1(CMS_SignerInfo *dest, CMS_SignerInfo *src)
  	{
  	unsigned char dig[EVP_MAX_MD_SIZE];
  	unsigned int diglen;
  	if (!cms_msgSigDigest(src, dig, &diglen))
  		{
  		CMSerr(CMS_F_CMS_MSGSIGDIGEST_ADD1, CMS_R_MSGSIGDIGEST_ERROR);
  		return 0;
  		}
  	if (!CMS_signed_add1_attr_by_NID(dest, NID_id_smime_aa_msgSigDigest,
  					V_ASN1_OCTET_STRING, dig, diglen))
  		{
  		CMSerr(CMS_F_CMS_MSGSIGDIGEST_ADD1, ERR_R_MALLOC_FAILURE);
  		return 0;
  		}
  	return 1;
  	}
  
  /* Verify signed receipt after it has already passed normal CMS verify */
  
  int cms_Receipt_verify(CMS_ContentInfo *cms, CMS_ContentInfo *req_cms)
  	{
  	int r = 0, i;
  	CMS_ReceiptRequest *rr = NULL;
  	CMS_Receipt *rct = NULL;
  	STACK_OF(CMS_SignerInfo) *sis, *osis;
  	CMS_SignerInfo *si, *osi = NULL;
  	ASN1_OCTET_STRING *msig, **pcont;
  	ASN1_OBJECT *octype;
  	unsigned char dig[EVP_MAX_MD_SIZE];
  	unsigned int diglen;
  
  	/* Get SignerInfos, also checks SignedData content type */
  	osis = CMS_get0_SignerInfos(req_cms);
  	sis = CMS_get0_SignerInfos(cms);
  	if (!osis || !sis)
  		goto err;
  
  	if (sk_CMS_SignerInfo_num(sis) != 1)
  		{
  		CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NEED_ONE_SIGNER);
  		goto err;
  		}
  
  	/* Check receipt content type */
  	if (OBJ_obj2nid(CMS_get0_eContentType(cms)) != NID_id_smime_ct_receipt)
  		{
  		CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NOT_A_SIGNED_RECEIPT);
  		goto err;
  		}
  
  	/* Extract and decode receipt content */
  	pcont = CMS_get0_content(cms);
  	if (!pcont || !*pcont)
  		{
  		CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NO_CONTENT);
  		goto err;
  		}
  
  	rct = ASN1_item_unpack(*pcont, ASN1_ITEM_rptr(CMS_Receipt));
  
  	if (!rct)	
  		{
  		CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_RECEIPT_DECODE_ERROR);
  		goto err;
  		}
  
  	/* Locate original request */
  
  	for (i = 0; i < sk_CMS_SignerInfo_num(osis); i++)
  		{
  		osi = sk_CMS_SignerInfo_value(osis, i);
  		if (!ASN1_STRING_cmp(osi->signature,
  					rct->originatorSignatureValue))
  			break;
  		}
  
  	if (i == sk_CMS_SignerInfo_num(osis))
  		{
  		CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NO_MATCHING_SIGNATURE);
  		goto err;
  		}
  
  	si = sk_CMS_SignerInfo_value(sis, 0);
  
  	/* Get msgSigDigest value and compare */
  
  	msig = CMS_signed_get0_data_by_OBJ(si,
  				OBJ_nid2obj(NID_id_smime_aa_msgSigDigest),
  					-3, V_ASN1_OCTET_STRING);
  
  	if (!msig)
  		{
  		CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NO_MSGSIGDIGEST);
  		goto err;
  		}
  
  	if (!cms_msgSigDigest(osi, dig, &diglen))
  		{
  		CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_MSGSIGDIGEST_ERROR);
  		goto err;
  		}
  
  	if (diglen != (unsigned int)msig->length)
  			{
  			CMSerr(CMS_F_CMS_RECEIPT_VERIFY,
  				CMS_R_MSGSIGDIGEST_WRONG_LENGTH);
  			goto err;
  			}
  
  	if (TINYCLR_SSL_MEMCMP(dig, msig->data, diglen))
  			{
  			CMSerr(CMS_F_CMS_RECEIPT_VERIFY,
  				CMS_R_MSGSIGDIGEST_VERIFICATION_FAILURE);
  			goto err;
  			}
  
  	/* Compare content types */
  
  	octype = CMS_signed_get0_data_by_OBJ(osi,
  				OBJ_nid2obj(NID_pkcs9_contentType),
  					-3, V_ASN1_OBJECT);
  	if (!octype)
  		{
  		CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NO_CONTENT_TYPE);
  		goto err;
  		}
  
  	/* Compare details in receipt request */
  
  	if (OBJ_cmp(octype, rct->contentType))
  		{
  		CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_CONTENT_TYPE_MISMATCH);
  		goto err;
  		}
  
  	/* Get original receipt request details */
  
  	if (CMS_get1_ReceiptRequest(osi, &rr) <= 0)
  		{
  		CMSerr(CMS_F_CMS_RECEIPT_VERIFY, CMS_R_NO_RECEIPT_REQUEST);
  		goto err;
  		}
  
  	if (ASN1_STRING_cmp(rr->signedContentIdentifier,
  					rct->signedContentIdentifier))
  		{
  		CMSerr(CMS_F_CMS_RECEIPT_VERIFY,
  					CMS_R_CONTENTIDENTIFIER_MISMATCH);
  		goto err;
  		}
  
  	r = 1;
  
  	err:
  	if (rr)
  		CMS_ReceiptRequest_free(rr);
  	if (rct)
  		M_ASN1_free_of(rct, CMS_Receipt);
  
  	return r;
  
  	}
  
  /* Encode a Receipt into an OCTET STRING read for including into content of
   * a SignedData ContentInfo.
   */
  
  ASN1_OCTET_STRING *cms_encode_Receipt(CMS_SignerInfo *si)
  	{
  	CMS_Receipt rct;
  	CMS_ReceiptRequest *rr = NULL;
  	ASN1_OBJECT *ctype;
  	ASN1_OCTET_STRING *os = NULL;
  
  	/* Get original receipt request */
  
  	/* Get original receipt request details */
  
  	if (CMS_get1_ReceiptRequest(si, &rr) <= 0)
  		{
  		CMSerr(CMS_F_CMS_ENCODE_RECEIPT, CMS_R_NO_RECEIPT_REQUEST);
  		goto err;
  		}
  
  	/* Get original content type */
  
  	ctype = CMS_signed_get0_data_by_OBJ(si,
  				OBJ_nid2obj(NID_pkcs9_contentType),
  					-3, V_ASN1_OBJECT);
  	if (!ctype)
  		{
  		CMSerr(CMS_F_CMS_ENCODE_RECEIPT, CMS_R_NO_CONTENT_TYPE);
  		goto err;
  		}
  
  	rct.version = 1;
  	rct.contentType = ctype;
  	rct.signedContentIdentifier = rr->signedContentIdentifier;
  	rct.originatorSignatureValue = si->signature;
  
  	os = ASN1_item_pack(&rct, ASN1_ITEM_rptr(CMS_Receipt), NULL);
  
  	err:
  	if (rr)
  		CMS_ReceiptRequest_free(rr);
  
  	return os;
  
  	}
  
  
  